@article {4460,
	title = {Selective CO2-to-CO photoreduction over an orthophosphate semiconductor via the direct Z-scheme heterojunction of Ag3PO4 quantum dots decorated on SnS2 nanosheets},
	journal = {Sustainable Energy \& Fuels},
	volume = {6},
	year = {2022},
	note = {n/a},
	month = {2022},
	pages = {4418 - 4428},
	publisher = {The Royal Society of Chemistry},
	abstract = {<p>Direct Z-scheme heterojunctions are widely used for photocatalytic water splitting and CO2 reduction due to facilitating well-separated photogenerated charge carriers and spatial isolation of redox reactions. Here, using a facile two-step hydrothermal and ion-exchange method, we uniformly decorate silver orthophosphate (i.e., Ag3PO4) quantum dots with an average characteristic size of \~{}10 nm over tin(iv) sulphide (i.e., SnS2) nanosheets to form a 0D/2D heterojunction. The direct Z-scheme mechanism, i.e. charge transport for efficient electron (from SnS2) and hole (from Ag3PO4) recombination, is confirmed by the following experiments: (i) ultraviolet and X-ray photoelectron spectroscopies; (ii) photodeposition of Pt and PbO2 nanoparticles on reduction and oxidation sites, respectively; (iii) in situ X-ray photoelectron spectroscopy; and (iv) electron paramagnetic resonance spectroscopy. Owing to the photoreduction properties of Ag3PO4 with orthophosphate vacancies, Z-scheme charge carrier transfer, and efficient exciton dissociation, an optimized heterojunction shows a high CO2-to-CO reduction yield of 18.3 μmol g-1 h-1 with an illustrious selectivity of \~{}95\% under light illumination, which is about 3.0 and 47.8 times larger than that of Ag3PO4 and SnS2, respectively. The carbon source for the CO product is verified using a 13CO2 isotopic experiment. Moreover, by tracing the peak at \~{}1190 cm-1 in the dark and under light irradiation, in situ diffuse reflectance infrared Fourier transform spectroscopy demonstrates that the CO2 reduction pathway goes through the COOH* intermediate.</p>
},
	url = {http://dx.doi.org/10.1039/D2SE00873D},
	author = {Fang-Yu Fu and Fan, Chi-Chan and Mohammad Qorbani and Huang,Chih-Yang and Kuo, Ping-Chun and Jih-Shang Hwang and Shu, Guo-Jiun and Chang, Sue-Min and Heng-Liang Wu and Chih-I Wu and Kuei-Hsien Chen and Li-Chyong Chen}
}
